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Between 2014 and 2016, ESA’s Rosetta OSIRIS cameras acquired multiple-filters imagesof the layered nucleus of comet 67P/Churyumov–Gerasimenko, ranging from ultraviolet tonear-infrared wavelengths. No correlation between layers disposition and surface spectralvariegation has been observed so far. This paper investigates possible spectral differencesamong decametre-thickness outcropping layers of the biggest lobe of the comet by meansof OSIRIS image dataset. A two-classes maximum likelihood classification was applied onconsolidated outcrops and relative deposits identified on post-perihelion multispectral imagesof the big lobe. We distinguished multispectral data on the basis of the structural elevation ofthe onion-shell Ellipsoidal Model of 67P. The spatial distribution of the two classes displays aclear dependence on the structural elevation, with the innermost class resulting over 50 per centbrighter than the outermost one. Consolidated cometarymaterials located at different structurallevels are characterized by different brightness and revealed due to the selective removal oflarge volumes. This variegation can be attributed to a different texture of the outcrop surfaceand/or to a different content of refractory materials.

The big lobe of 67P/Churyumov–Gerasimenko comet: morphological and spectrophotometric evidences of layering as from OSIRIS data